Smart Traffic Signal System

Northern Virginia

Pedestrian and Bicycle Information Center (PBIC)


Population growth led to higher pedestrian traffic requiring more and better facilities.


The Northern Virginia District (NOVA) of the Virginia DOT oversees a uniquely urbanizing sector, part of which is within the Washington DC metropolitan area. Explosive growth contributed to congestion and increased the demand for multi-modal planning. The project focused on improving pedestrian accessibility, particularly for persons with disabilities.


The NOVA District Smart Traffic Signal System staff partnered with other departments to find equipment that met departmental goals for functionality and "federal-acceptability" as defined in The Manual of Uniform Traffic Control Devices. Other core stakeholders were included in the process, including regional agencies and focus groups of persons with disabilities.

A pushbutton sign for the Smart Traffic Signal program.

Five specific measures were implemented in the end. First, the Rest-in-Walk Pilot Project in the planned mixed use community of Reston, VA. Reston Parkway, with an average of 29,000 vehicles-per-day, bisects the community and requires pedestrians traveling between several commercial village centers to cross a four-lane arterial road. At nine of the seventeen intersections, the walk indication displays coordinated with the green signal, rather than requiring the pedestrian to activate it through a pushbutton system that often resulted in up to a three minute wait. The intent is to reduce the number of pedestrians illegally and dangerously crossing the street out of frustration. These intersections are also now being considered for accessible pedestrian signal installation.

Second, advanced pedestrian walk phasing was installed at a high-traffic intersection between an 8-lane arterial and a popular avenue. The advance display for the walk indication gives time for pedestrians to establish their presence in the crosswalk before being overtaken by right turning vehicles.

Third, a "pedestrian clear count-down" signal was installed at a busy regional hub for subway and bus transit. Fourth, an Accessible Pedestrian Signal (APS) featuring a locator tone, vibration and a verbal message indicating in which direction to cross for visually impaired persons was also installed. The location of the pushbutton was also moved to be more accessible. Due to strict demands for
federally approved equipment, such improvements were previously not possible, and work had to be done to break down institutional barriers. Three additional intersections are now identified to receive the same improvements.

The last measure undertaken was the installation of signing placards along an intensive business corridor spanning the length of Fairfax County. The eighteen placards clearly explain pedestrian signal operations to the diverse pedestrian population living along the corridor.


Constituents were pleased with the results of the initiatives, and several citizens were quoted as saying that the improvements have "made it much safer to get across." Costs associated with the project were minimal, and more key intersections are scheduled for the future. Institutional barriers to implementing federally unapproved Accessible Pedestrian Signaling were relaxed to allow for more creative problem-solving.


Virginia Department of Transportation
Northern Virginia District
14685 Avion Parkway
Chantilly, VA 20151-1104
(703) 383-8368

Image Source

Institute of Tranportation Engineers Pedestrian Project Awards Appliction. Viginia Dept. of Transportation.

Filed in: Engineering, Case Studies

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